CN2514610Y - Low-voltage large current heater with abnormal protective circuit - Google Patents
Low-voltage large current heater with abnormal protective circuit Download PDFInfo
- Publication number
- CN2514610Y CN2514610Y CN 01261887 CN01261887U CN2514610Y CN 2514610 Y CN2514610 Y CN 2514610Y CN 01261887 CN01261887 CN 01261887 CN 01261887 U CN01261887 U CN 01261887U CN 2514610 Y CN2514610 Y CN 2514610Y
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- loop
- work
- heating tube
- electric heating
- heating
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Abstract
The utility model discloses a low-voltage high-current heating device which is provided with an abnormal protecting circuit, wherein an operating loop of an electric heating pipe 2 is composed of the connection of a fuse 1, the electric heating pipe 2, a heating operating loop joint 5 and an abnormal protecting device 6. The input end of an operating control unit 4 is connected into an output signal of a heating temperature controller 3 which detects the limit condition of the liquid temperature, and the output end is connected with a control end of the heating operating loop joint 5; the input end of the abnormal protecting device 6 is connected into an output signal of an overheating detector 7 which detects the overheating condition of the electric heating pipe 2; the operating control unit 4 can control the heating operating loop 5 to turn on and turn off according to the output signal of a heating temperature controller 3; and the abnormal protecting device 6 can cause the heating operating loop to turn on or turn off according to the output signal of the overheating detector 7.
Description
Technical field: the utility model relates to the abnormal protection of low-voltage, high-current liquid electric heating tube.
Background technology: in some specific occasions, consider, often adopt the electric heating tube of low-pressure type that liquid is heated from Electrical Safety or applicable power supply.For satisfying the requirement of heating power; this type of electric heating tube is generally worked under current state; the control of its operating state often adopts temperature controller to carry out in conjunction with the method for high-current relay; and the protection of its operating state only depends on the electric heating tube fuse to finish usually; be the closure that working relay and fuse are depended in the connection in electric heating tube work loop, the disconnection of working relay or fuse is depended in the disconnection in electric heating tube work loop.
Under the normal operating conditions, the control of working unit of electric heating tube connects the electric heating tube working relay according to the temperature controller working state signal, and the work loop of electric heating tube is connected, and electric heating tube work is heated liquid; In case when fluid temperature reached the ceiling temperature of temperature controller, temperature controller was sent stop signal, the control of working unit control electric heating tube working relay disconnection by electric heating tube disconnects the work loop of electric heating tube, and electric heating tube stops heating; When fluid temperature is lower than the lower limit temperature of temperature controller, temperature controller is sent working state signal again, is connected by the control of working unit control electric heating tube working relay of electric heating tube, and the work loop of electric heating tube recloses, electric heating tube work enters new duty cycle.
Generally speaking, in order to improve the efficient of liquid heat, in the heating vessel outside insulation material has been installed all, on the other hand, there is such possibility,, the work loop of electric heating tube connected unusually because of electric heating tube working relay Control Failure, and irrelevant with the status signal of temperature controller output, the abnormality of electric heating tube abnormal work appears.At this moment, because the work loop of electric heating tube is connected unusually, fluid temperature also continues to heat up constantly after surpassing the liquid ceiling temperature, more serious electric heating tube " dry combustion method " phenomenon may occur, if the operating current of electric heating tube is still within the current limit value of electric heating tube fuse at this moment, the work loop of electric heating tube can't cut off at all, then may make liquid container or insulation material cause security incident because of the high temperature that the electric heating tube abnormal work produces.
Certainly, when the abnormal work state appears in electric heating tube, if adopt the method for the fuse blows manage to make electric heating tube, to reach the work loop that cuts off electric heating tube, make the out-of-work purpose of electric heating tube, the electric heating tube that uses big current work is carried out the device of liquid heat, obviously there is unsafe factor in the method, therefore, do not adopt the method for fusing fuse and method that the work loop of electric heating tube is disconnected is necessary and should is safely and effectively.
Summary of the invention: the utility model inserts abnormal protection device exactly in electric heating tube work loop; it does not influence the operate as normal of electric heating tube; and when the abnormal work state appears in electric heating tube; cut off the work loop of electric heating tube; electric heating tube is quit work, realize the purpose that the accident that prevents takes place.
Referring to Fig. 1, Fig. 1 is the application block diagram of abnormal protection device.
From Fig. 1 as seen, the work loop of electric heating tube 2 is linked to each other and is constituted by fuse 1, electric heating tube 2, heating work loop contact 5, abnormal protection device 6.Wherein the connection of arbitrary parts disconnects, and electric heating tube work loop is disconnected, and electric heating tube 2 is quit work.The input of control of working unit 4 inserts the output signal of the heating and temperature control device 3 that the fluid temperature finite-state is detected, and its output links to each other with the control end of heating work loop contact 5; The input of abnormal protection device 6 inserts the output signal of the overtemperature detector 7 that detects heating tube 2 overtemperature states; Control of working unit 4 can be according to the output signal of heating and temperature control device 3, control heating work loop 5 contact connecting and disconnecting, and abnormal protection device 6 can be switched on or switched off the heating work loop according to the output signal of overtemperature detector 7.
When electric heating tube work loop produced overcurrent, fuse 1 fusing disconnected electric heating tube work loop, and electric heating tube 2 quits work;
Under the normal condition, control of working unit 4 is according to the state of heating and temperature control device 3, and the connecting and disconnecting of control heating tube work loop contact 5 make electric heating tube 2 work or quit work; Abnormal protection device 6 is when electric heating tube 2 operate as normal; for heating tube work loop provides path; when electric heating tube 2 operation irregularities; electric heating tube 2 was still in heating work after fluid temperature surpassed the ceiling temperature of temperature controller 3; when making fluid temperature reach the operating temperature of the overtemperature detector 7 that abnormal protection device 6 connected; abnormal protection device 6 just disconnects the work loop of heating tube, and electric heating tube 2 is quit work, and has prevented that the state of affairs from developing further.
Description of drawings: accompanying drawing 1 is the application block diagram of abnormal protection device, and accompanying drawing 2 is the electrical schematic diagram of embodiment.
Embodiment: referring to Fig. 2, the work control loop is linked to each other and is constituted by fuse 1, temperature controller 3, working relay line bag 4; The heating work loop is linked to each other and is constituted by fuse 1, electric heating tube 2, working relay contact 5, abnormal protection contact 8; The protection loop is linked to each other and is constituted by fuse 1, overtemperature detector 7, protection relay line bag 6.
Under the normal condition, when fluid temperature does not reach the control temperature of temperature controller 3, the junction closure of overtemperature detector 7, the protection circuit communication, protection relay line bag 6 gets electric adhesive, abnormal protection contact 8 closures, and the junction closure of temperature controller 3, the work control loop is communicated with, working relay line bag 4 gets electric adhesive, makes its contact 5 closures, and the heating work loop is connected, electric heating tube 2 gets electric work, and liquid constantly heats up;
Rise to the ceiling temperature of temperature controller 3 when fluid temperature, and when not reaching the design temperature of overtemperature detector 7, the contact of temperature controller 3 disconnects, the work control loop disconnects, working relay contact 5 is discharged, the heating work loop disconnects, and electric heating tube 2 quits work, and on-state is not then still kept because the contact of overtemperature detector 7 disconnects in the protection loop;
When fluid temperature drops to the lower limit temperature of temperature controller 3, the junction closure of temperature controller 3, the work control loop is connected, working relay contact 5 closures, the work loop is connected, and electric heating tube 2 gets electric work, and liquid continues to obtain to heat up;
When the contact 5 of working relay occurs closed unusually, even fluid temperature has made the contact of temperature controller 3 disconnect, the work control loop is disconnected, but on-state is still kept in the heating work loop, when the work of electric heating tube 2 makes fluid temperature reach the design temperature of overtemperature detector 7, the contact of overtemperature detector 7 disconnects, make protection relay line bag 6 dead electricity, abnormal protection contact 8 discharges, and the heating work loop is disconnected, electric heating tube 2 is quit work, stop the further rising of fluid temperature;
When fluid temperature descends; overtemperature detector 7 recovers to connect; because of the fault of working relay contact 5 still exists; the heating work loop still can be connected once more; but liquid (or the air behind the dried liquid) is when temperature reaches the design temperature of overtemperature detector 7; the protection action will occur once more, therefore, can avoid the serious disastrous effect that produces because of " dry combustion method " effectively.
Present embodiment is a comparatively simple application example, under thought of the present utility model, also can expand out more applications.
Claims (2)
1, a kind of low-voltage, high-current electric heater unit with abnormity protection circuit, constitute by work loop and work control loop, it is characterized in that the work loop connects abnormal protection device, the work loop of electric heating tube 2 comprises fuse 1, electric heating tube 2, heating work loop contact 5, the input of control of working unit 4 inserts the output signal of the heating and temperature control device 3 that the fluid temperature finite-state is detected, and its output links to each other with the control end of heating work loop contact 5; The input of abnormal protection device 6 inserts the output signal of the overtemperature detector 7 that detects heating tube 2 overtemperature states.
2, a kind of low-voltage, high-current electric heater unit according to claim 1 with abnormity protection circuit, it is characterized in that it comprises work control loop, heating work loop, the protection loop, the work control loop is linked to each other and is constituted by fuse 1, temperature controller 3, working relay line bag 4; The heating work loop is linked to each other and is constituted by fuse 1, electric heating tube 2, working relay contact 5, abnormal protection contact 8; The protection loop is linked to each other and is constituted by fuse 1, overtemperature detector 7, protection relay line bag 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01261887 CN2514610Y (en) | 2001-09-25 | 2001-09-25 | Low-voltage large current heater with abnormal protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01261887 CN2514610Y (en) | 2001-09-25 | 2001-09-25 | Low-voltage large current heater with abnormal protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2514610Y true CN2514610Y (en) | 2002-10-02 |
Family
ID=33669746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01261887 Expired - Fee Related CN2514610Y (en) | 2001-09-25 | 2001-09-25 | Low-voltage large current heater with abnormal protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2514610Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325393A (en) * | 2011-09-09 | 2012-01-18 | 深南电路有限公司 | Igniting prevention protecting device for liquid electric heater and liquid electric heater |
| CN103490237A (en) * | 2013-09-27 | 2014-01-01 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug having over-temperature detecting function |
-
2001
- 2001-09-25 CN CN 01261887 patent/CN2514610Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325393A (en) * | 2011-09-09 | 2012-01-18 | 深南电路有限公司 | Igniting prevention protecting device for liquid electric heater and liquid electric heater |
| CN103490237A (en) * | 2013-09-27 | 2014-01-01 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug having over-temperature detecting function |
| CN103490237B (en) * | 2013-09-27 | 2016-07-06 | 余姚市嘉荣电子电器有限公司 | Leakage protecting plug with overtemperature detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |